<template>
    <div>
        <city-header></city-header>
        <city-search :cities='cities'></city-search> 
        <city-list 
            :cities='cities' 
            :hotCities='hotCities' 
            :letter="letter"
        ></city-list>
        <!-- 监听传出的change事件 -->
        <city-alphabet 
            :cities='cities'
            
            @change="handleLetterChange"
        ></city-alphabet>
    </div>
</template>

<script>
import CityHeader from './components/Header'
import CitySearch from './components/Search'
import CityList from './components/List'
import CityAlphabet from './components/Alphabet'
import axios from 'axios'
export default {
    name: "City",
    data () {
        return  {
            // 数据的默认值
            city: '',
            hotCities: [],
            cities: {},
            letter: ''
        }
    },
    components:{
        CityHeader,
        CitySearch,
        CityList,
        CityAlphabet
    },
    methods: {
        getCityInfo () {
            axios.get('/api/city.json')
            .then(this.handleGetCityInfoSucc)
        },
        handleGetCityInfoSucc (res) {
            res = res.data;
            if (res.ret && res.data) {
                const data = res.data;
                this.city = data.city;
                this.hotCities = data.hotCities;
                this.cities = data.cities;
                // console.log(this.city)
            }
        },
        handleLetterChange (letter) {
            //保存子组件传出的letter，以供后续传给其他子组件
            this.letter = letter
        }
    },
    mounted () {
        this.getCityInfo()
    }
}
</script>

<style lang='stylus' scoped>

</style>